Statements of Shareholders’ Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total USD ($)	Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] USD ($)	Series F Convertible Preferred Stock [Member] USD ($)	Convertible Preferred Stock [Member] Series C-1 Convertible Preferred Stock [Member] USD ($)	Convertible Preferred Stock [Member] Series C-1 Convertible Preferred Stock [Member] Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] USD ($)	Convertible Preferred Stock [Member] Series C-2 Convertible Preferred Stock [Member] USD ($)	Convertible Preferred Stock [Member] Series D-1 Convertible Preferred Stock [Member] USD ($)	Convertible Preferred Stock [Member] Series D-1 Convertible Preferred Stock [Member] Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] USD ($)	Convertible Preferred Stock [Member] Series F Convertible Preferred Stock [Member] USD ($)	Convertible Preferred Stock [Member] Series F Convertible Preferred Stock [Member] Conversion of Series F Preferred Stock into Common Stock [Member] USD ($)	Common Stock [Member] USD ($)	Common Stock [Member] Conversion of Series F Preferred Stock into Common Stock [Member]	Common Stock [Member] Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] USD ($)	Common Stock [Member] Series C-1 Convertible Preferred Stock [Member]	Common Stock [Member] Series F Convertible Preferred Stock [Member]	Additional Paid-in Capital [Member] USD ($)	Additional Paid-in Capital [Member] Conversion of Series F Preferred Stock into Common Stock [Member] USD ($)	Additional Paid-in Capital [Member] Conversion Of Series C-1 And D-1 Preferred Stock Into Common Stock [Member] USD ($)	Accumulated Deficit [Member] USD ($)
Beginning Balance at Dec. 31, 2012	$ 3,214			$ 5,792		$ 500	$ 4,615		$ 0		$ 1					$ 439,672			$ (447,366)
Beginning Balance, shares at Dec. 31, 2012				6,000		1,000	5,000		0		285,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Preferred Stock dividends, shares				1,000
Issuance of Preferred Stock dividends	0			744		57										(801)
Issuance of stock, shares									3,000		1,929,000
Issuance of stock	6,750		3,250						3,250		2					6,748
Conversion of Preferred Stock into common stock, shares					1,000								(367,000)
Conversion of Preferred Stock into common stock		0			(77)			(47)										124
Redemption of Series D-1 Preferred Stock, shares							(5,000)
Redemption of Series D-1 Preferred Stock	0						(4,568)									4,568
Exchange of Series C-2 Preferred Stock for Series C-1 Preferred Stock, shares				1,000		(1,000)
Exchange of Series C-2 Preferred Stock for Series C-1 Preferred Stock	0			557		(557)
Share-based compensation expense	12,373															12,373
Third party share-based compensation expense	0
Issuance of restricted stock awards, shares											1,823,000
Issuance of restricted stock awards	1										1
Net loss	(17,935)																		(17,935)
Ending Balance at Dec. 31, 2013	7,653			7,016		0	0		3,250		4					462,684			(465,301)
Ending Balance, shares at Dec. 31, 2013				7,000		0	0		3,000		4,404,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Adjustment for reverse stock split											(4)					4
Issuance of stock, shares											5,395,000			5,341,670	129,105
Issuance of stock	53,063										1					53,062
Conversion of Preferred Stock into common stock, shares					(3,000)							(129,000)	(5,342,000)
Conversion of Preferred Stock into common stock		0			(3,099)					(452)			1				452	3,098
Common stock issued for services, shares											3,000
Common stock issued for services	25															25
Restricted stock awards canceled, shares											(47,000)
Restricted stock awards canceled	(27)															(27)
Share-based compensation expense	8,992															8,992
Third party share-based compensation expense	63															63
Net loss	(21,313)																		(21,313)
Ending Balance at Dec. 31, 2014	$ 48,456			$ 3,917		$ 0	$ 0		$ 2,798		$ 2					$ 528,353			$ (486,614)
Ending Balance, shares at Dec. 31, 2014				4,000		0	0		3,000		15,226,000